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iosswiftxcodedecimallocale
Artiom
Artiom

Reputation: 623

Swift show price depends on Locale

I am getting a string value that represents a price. I want to convert it to another string with specific precision and format it according to a current device Locale.

Decimal(string: "123,4567", locale: NSLocale.current)?.formatted(.number.precision(.fractionLength(precision)))

This code works for the german language and the output is "123,45". But if I switch to English the output is "123.00". The problem is with the dot instead of the comma. Any ideas how to fix it and show the correct number "123.45"?

Upvotes: 0

Views: 1323

Answers (2)

Leo Dabus
Leo Dabus

Reputation: 236285

If all you need is to format your decimal number to be displayed using a specific currency what you need is Decimal.FormatStyle.Currency. It will automatically discard the excess of precision length:

let valueString = "1234,5678"
let decimalLocale: Locale = .init(identifier: "de_DE")
let currencyLocale: Locale = .init(identifier: "en_US")  // or current (used US locale just for demonstration purposes)
if let decimal = Decimal(string: valueString, locale: decimalLocale),
    let currencyCode = currencyLocale.currencyCode {
    let currencyStyle: Decimal.FormatStyle.Currency = .init(code: currencyCode, locale: currencyLocale)
    let currencyFormatted = decimal.formatted(
        currencyStyle.rounded(rule: .towardZero)
    )
    print(currencyFormatted)  // "$1,234.56\n"
}

edit/update:

I usually don't like manipulating strings but if your source doesn't have a specific format where sometimes de decimal separator is a comma and sometimes a period you need to replace your string comma with a period before converting it to Decimal:

let valueString = "1234,5678"
let currencyLocale: Locale = .init(identifier: "en_US")  // or current (used US locale just for demonstration purposes)
if let decimal = Decimal(string: valueString.replacingOccurrences(of: ",", with: ".")),
    let currencyCode = currencyLocale.currencyCode {
    let currencyStyle: Decimal.FormatStyle.Currency = .init(code: currencyCode, locale: currencyLocale)
    let currencyFormatted = decimal.formatted(
        currencyStyle.rounded(rule: .towardZero)
    )
    print(currencyFormatted)  // "$1,234.56\n"
}

Upvotes: 1

Joakim Danielson
Joakim Danielson

Reputation: 51872

The locale used for the input string must match the format of the string, so if it is a German format then use a German locale

let locale = Locale(identifier: "de_DE")
let string = Decimal(string: "123,4567", locale: locale)?
    .formatted(.number.precision(.fractionLength(precision)))

This uses Locale.current (Swedish in this example) for the output

123,46

Since this is a price here is a currency example

let string = Decimal(string: "123,4567", locale: .current)?
    .formatted(.currency(code: "EUR")
        .precision(.fractionLength(2))
        .rounded(rule: .down)
        .locale(.current))

€123,45

Upvotes: 1

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